A semi-cooked squid inseminated a 63-year-old Korean woman's mouth as she was eating it causing her to feel a "pricking and foreign-body sensation", according to research.

The woman, from Seoul, immediately spat out the partially boiled squid along with its internal organs after experiencing severe pain in her mouth.

Despite that, she could feel many "small squirming'' organisms in her mouth.

A trip to the hospital revealed she had twelve "small, white, spindle-shaped, bug-like organisms stuck in the mucous membrane of the tongue, cheek and gingiva", the researchers said.